Radson fault code A6
Fault code A6 on a Radson boiler (including Maxicom) means: Flue gas NTC (4). Reset the appliance once. If the code comes back, a part is usually faulty, often a temperature sensor. You can check the water pressure and settings yourself; leave work on gas-carrying parts to a certified gas engineer.
After a safety alert (gas, flue gas, combustion), reset no more than once and call in a certified gas engineer. If you smell gas, call your national gas emergency number or 112 immediately.
Cause
Fault code A6 on a Radson boiler indicates: Flue gas NTC (4).
Fixing fault code A6: step by step
- Check outside that the air intake and flue are clear (leaves, a nest, ice or snow).
- Check that the condensate trap under the appliance is filled and clean; a blocked condensate drain can make the boiler lock out.
- Reset the appliance once. If the code comes straight back, do not keep resetting it.
- If the code comes back, stop resetting: a flue problem can let carbon monoxide (CO) into the home. Call in a qualified heating engineer and make sure you have a working CO alarm.
Applies to
Radson Maxicom, NL / E.
Click a model for the parts list and exploded view of that appliance.
Matching parts
Radson parts are available from Instalpunt; shipping to EU countries from €12.95 (€16.95 for more distant countries), usually 3–5 working days.
Based on the cause, these original Radson parts fit (always check the type number of your appliance):
Bosch NTC flow + O-ring € 100.21
Further reading on this cause
Other Radson codes with the same cause
- 7 — NTC 1 or 2 open circuit or short circuit
- 8 — NTC 2 open circuit or short circuit
- A7 — Return NTC (2) defective
- Ad — Domestic hot water sensor fault.
- CC — Outdoor sensor defective
- E1 — NTC (1) too high
Fix it yourself or call an engineer?
Always consult the manual for your appliance and work safely. If in doubt or if the fault comes back, call in a qualified professional. A question about a part? Write to us at info@instalpunt.nl.
Frequently asked questions
What does Radson boiler fault code A6 mean?
Flue gas NTC (4).
How do I fix fault code A6 on a Radson boiler?
First check the cause described above. Then restart the appliance using the reset button. If the message comes back, a part usually needs replacing or the fault needs to be repaired by a qualified professional.
Which parts do I need for Radson fault code A6?
That depends on the exact cause. In the Radson parts overview at Instalpunt you will find the current price and stock for each part.
Can I fix fault code A6 myself?
You can reset the appliance and check things like the water pressure or settings yourself. Work on gas-carrying parts must be left to a certified gas engineer.
All Radson boiler faults and codes at a glance →